JPS644727A - Camera - Google Patents

Abstract

PURPOSE:To obtain an inexpensive camera, whose structure is simple, having an excellent photographing function equal to an autofocusing camera by providing a range finder in a pan-focus camera or a zone focus camera and setting a diaphragm in a desirable set diaphragm value. CONSTITUTION:A signal 2 showing the set photographing distance of a photographic lens 1 and a measured distance signal 4 showing the measured distance from a range finder 3 are inputted in a diaphragm arithmetic circuit 5 so as to compute the set diaphragm value by which the position of an object is within the depth of field of the photographic lens and a set diaphragm value signal 6 is outputted. When the opening of the diaphragm reaches the set diaphragm value, the diaphragm is held in the set diaphragm value or when the diaphragm value computed from the sensitivity of a film, the luminance of the field and a set exposing time is smaller than the set diaphragm value, it is held in the computed diaphragm value, by a control circuit 29. And also before the opening of the diaphragm reaches the set diaphragm value, closing actuation can be started. Thus, photographing whose precision is as excellent as that of a conventional autofocusing camera can be always possible by the inexpensive camera whose structure is simple.